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Beaufort Sea Ursus Ursus maritimus biota Chukchi Sea animals/vertebrates behavior dens energetics physical activity Alaska Animals Mammals mammals ANIMALS/VERTEBRATES Alaska, polar bear; Ursus maritimus; denning phenology; southern Beaufort; Chukchi Sea, behavior, denning, vertebrates, mammals Animals/Vertebrates, Mammals, Carnivores, Bears, Species life history, Marine mammals, Body composition, Diets, Wildlife food habits, Mercury levels, Bioaccumulation, Wildlife, Keystone species, Marine ecosystems, Coastal ecosystems, Terrestrial ecosystems, Health and disease, Gut microbiota, Gastrointestinal microbiome, Polar bear, Ursus maritimus Animals/Vertebrates, Mammals, Carnivores, Bears, Species life history, Marine mammals, Body composition, Diets, Wildlife food habits, Wildlife, Keystone species, Marine ecosystems, Coastal ecosystems, Terrestrial ecosystems, Health and disease, Polar bear, Ursus maritimus, Quantitative fatty acid signature analysis, QFASA Animals/Vertebrates, Mammals, Carnivores, Bears, Trophic dynamics, Marine mammals, Diets, Wildlife food habits, Wildlife, Marine ecosystems, Coastal ecosystems, QFASA, Polar bears, Ursus maritimus Argos Behavior Endangered Animals Food consumption Mammals , Carnivores , Bears , Trophic Dynamics , Marine mammals , Age composition , Diets , Wildlife food habits , Wildlife , Marine ecosystems , Coastal ecosystems , Quantitative fatty acid signature analysis , QFASA , Polar Bears , Ursus maritimus , Ringed Seal , Pusa hispida , Bearded Seal , Erignathus barbatus Mammals, Carnivores, Bears, Animal behavior, Marine mammals, Foraging behavior, Diets, Wildlife food habits, Wildlife, Marine ecosystems, Nutrition, Protein, Polar Bears, Ursus maritimus, Fat Mammals, Carnivores, Bears, Marine mammals, Threatened species, Seasonal distribution, Wildlife, Terrestrial ecosystems, Coastal ecosystems, Polar Bear, Ursus maritimus, Aerial Survey Marine mammals Marine mammals, Disease detection, Animal morphology, Body composition, Wildlife, Keystone species, Marine ecosystems, Coastal ecosystems, Terrestrial ecosystems, Endocrinology, Immunology, Health and disease, Hydrocortisone, Estradiol, Progesterone, Testosterone, Creatinine, Polar Bear, Ursus maritimus, Cortisol, Beaufort Sea Marine mammals, Disease detection, Bacterial diseases, Parasitic diseases, Wildlife food habits, Wildlife, Parasites, Marine ecosystems, Coastal ecosystems, Terrestrial ecosystems, Ecotoxicology, Human impacts, Health and disease, Coxiella, Toxoplasma, Brucella, Neospora, Francisella, Polar Bear, Ursus maritimus, Environmental contaminants, PCB, Polychlorinated biphenyls, ClBz, Chlorobenzene, HCH, Hexachlorocyclohexane, DDT, Dichlorophenyltrichloroethane, Organochlorine PTT